Double-Ring Shading Ring for Loudspeaker Magnetic Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional loudspeaker designs face issues with the repulsive force between the secondary magnet and the main magnet, leading to deformation and harmonic distortion due to the lightweight shading ring being affected by this force, which affects the acoustic performance.
Innovation Solution
A double-ring shading ring structure with a first ring body and a second ring body, where the second ring body is formed by bending the lower end of the first ring body outward, is integrated into the magnetic circuit system, optimizing connections with the main magnet, secondary magnet, and washer to reduce repulsive forces and adhesive overflow, thereby stabilizing the magnetic circuit and improving acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lightweight metal shading ring is used, then the inductance of the voice coil is reduced and frequency response is improved, but the shading ring is greatly affected by repulsive force between magnets leading to deformation
Solution Approach 1:
The shading ring is divided into two separate rings: a first shading ring made of lightweight metal (copper or aluminum) that contacts the voice coil, and a second shading ring made of heavy metal (lead or steel) that contacts the secondary magnet. This segmentation allows each ring to perform its specific function while avoiding the problem of deformation from repulsive forces affecting the entire single ring structure.
Solution Approach 2:
Different parts of the shading system are made of different materials with different properties. The first shading ring uses lightweight metal for optimal electrical performance and inductance reduction, while the second shading ring uses heavy metal for mechanical stability and resistance to repulsive forces. This local differentiation of material properties resolves the contradiction between lightweight performance and structural stability.
2Device complexity
If the shading ring is disposed between the secondary magnet and washer, then the structure is simplified, but the secondary magnet is not firmly bonded due to strong repulsive force
Solution Approach 1:
The shading function is segmented into two separate rings positioned at different locations in the magnetic circuit. The first shading ring is positioned near the voice coil, and the second shading ring is positioned near the secondary magnet. This segmentation allows the bonding interface to be separated from the high repulsive force zone, enabling reliable bonding while maintaining the simplified structure.
Solution Approach 2:
The first shading ring acts as an intermediary element between the voice coil and the magnetic circuit components. It provides the shading function while being positioned away from the direct repulsive force between the secondary magnet and washer, thereby mediating the interaction and avoiding bonding failures.
3Reliability
If adhesive is used to fix the shading ring, then the shading ring is securely attached, but adhesive overflow affects product quality
Solution Approach 1:
The shading ring is segmented into two separate rings that are attached at different locations in the magnetic circuit. This segmentation allows each ring to be attached in a location with better adhesive control and less risk of overflow affecting product quality, while maintaining secure attachment through the distributed bonding locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces deformation, harmonic distortion, and nonlinear inductance, enhancing the overall acoustic performance and tone quality of the loudspeaker by stabilizing the magnetic circuit and minimizing the impact of repulsive forces.
Implementation Method 1
an induction current in a reverse direction is also caused. With excessively large self inductance of the voice coil, the generated induction current is large
Implementation Method 2
The shading ring may offset the influence of an induction current of the voice coil to a magnetic field in the loudspeaker
Implementation Method 3
a very strong repulsive force is formed between the secondary magnet and a main magnet, and the shading ring is generally made of a metal material and is lightweight and thus is greatly affected by the repulsive force
Data Source
AI summary
A shading ring is disposed in a magnetic circuit system. The magnetic circuit system includes a main magnet, a washer, a voice coil and a secondary magnet. The shading ring is located inside the voice coil. The shading ring includes a first ring body and a second ring body. The second ring body is formed by bending a lower end of the first ring body outward. The first ring body includes a first perpendicular portion and a first horizontal portion. A first cavity is formed inside the first perpendicular portion. The secondary magnet is located in the first cavity. The first horizontal portion is fixedly connected to an upward side of the secondary magnet. The shading ring is arranged into a structure having the first ring body and the second ring body.